@jonahsnider/util

    Function partition

    • Split an iterable into 2 arrays of elements that passed or failed a provided type guard.

      Time complexity: O(n)

      Space complexity: O(n)

      Type Parameters

      • S
      • T

      Parameters

      • iterable: Iterable<T>

        The iterable to partition

      • typeGuard: (element: T) => element is S

        The type guard to apply to each element of iterable. If the type guard returns a truthy value the element will be added to the passed array in the result. Otherwise, it will be added to the failed array.

      Returns [passed: S[], failed: Exclude<T, S>[]]

      A tuple where the 1st element is an array of elements that passed the predicate (passed) and the 2nd element are the elements that failed the predicate (failed)

      Iterable

      const [numbers, strings] = partition(['a', 1, 'b', 2, 'c', 3], (element): element is number => typeof element === 'number');

      console.log(numbers); // [1, 2, 3]
      console.log(strings); // ['a', 'b', 'c']

    • Split an iterable into 2 arrays of elements that passed or failed a provided predicate.

      Time complexity: O(n)

      Space complexity: O(n)

      Type Parameters

      • T

      Parameters

      • iterable: Iterable<T>

        The iterable to partition

      • predicate: (value: T, increment: number) => unknown

        The predicate to apply to each element of iterable. If the predicate returns a truthy value the element will be added to the passed array in the result. Otherwise, it will be added to the failed array.

      Returns [passed: T[], failed: T[]]

      A tuple where the 1st element is an array of elements that passed the predicate (passed) and the 2nd element are the elements that failed the predicate (failed)

      Iterable

      const [odd, even] = partition([1, 2, 3, 4, 5, 6], num => num % 2);

      console.log(odd); // [1, 3, 5]
      console.log(even); // [2, 4, 6]

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